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FLC or Full Load Current is typically used when dealing with the theoretical capacity of a motor, whereas FLA or Full Load Amps is used to describe the actual known capacity of a particular motor. Thus system designers tend to use the FLC to size and design cables, overcurrent devices, switches, etc, whereas those who have a motor in their possession (plant engineers, electricians, etc) tend to work with FLA, because it is right on the nameplate of the motor in question. When sizing electrical systems FLC is considered proper methodology as it generally covers all motors of a given HP. Since one motor design has differnent losses than the next design, two motors of the same HP rating may in fact have a different FLA rating. And as we all know motors don't last forever. The next one put in may have a slightly higher FLA. So it is good practice to use the FLC tables from the NEC when sizing.

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